10th Class Mathematics Pair of Linear Equations in Two Variables Question Bank MCQs - Pair of Linear Equations in Two Variables

The value of a for which the lines \[x=1,\] \[y=2\] and \[\text{ax}+\text{2y}-\text{6}=0\]are concurrent is:

A) 1

B) 2

C) 3

D) 4

Correct Answer: B

Solution :

[b] Common solution of \[x=1\] and \[y=2\] is \[(1,2)\].

\[\Rightarrow \,\,\,\,\,\,\,\,\,\,a\times 1+2\times 2-6=0\]

\[\Rightarrow \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,a=2\]